Need a REF01 Replacement

[Sebo]

Hi:

I'm building a little single channel MIDI to CV that uses a DAC0831

(actually I going to use a DAC0832 because is cheaper to do the test).

It uses a REF01 as a voltage reference, but I can't find it in my country.

I can't find MAX672 and MAX674 either (this two are replacements of

the REF01).

Anybody knows of another replacement, easy to find. Or can I make

a discrete voltage reference (10V) for the DAC0831/2?

Thank you.

[AndrewMartens]

You can probably build your own voltage reference without too much difficulty.  Build a voltage divider (out of two resistors) between your regulated +12V and GND.  Feed the divided voltage into some opamp, it shouldn't really matter which one.  Since you want this to be really precise, you may want to add a trimmer potentiometer into your divider so that you can tune it precisely to +10V.  After everything has warmed up and you've tuned the output of the opamp to +10V, you should be able to feed that to your DAC (I think).

A project I'm working on right now uses this approach (a pair of 10k resistors and an LM358) to create a +2.5V reference between +5V and GND.

[Sebo]

Hi:

Thanks for the reply.

I found on the net a lot of replacements for REF01, but I can't found

them in the local stores.

I'm going to use a TL431 with a few resistors. The TL431 works as

a variable voltage reference, and is temp compensated.